function Sounds( Event, Entity )

 if ( Event:GetName() == 'player_hurt' ) then

     local ME = client.GetLocalPlayerIndex();

     local INT_UID = Event:GetInt( 'userid' );
     local INT_ATTACKER = Event:GetInt( 'attacker' );

     local NAME_Victim = client.GetPlayerNameByUserID( INT_UID );
     local INDEX_Victim = client.GetPlayerIndexByUserID( INT_UID );

     local NAME_Attacker = client.GetPlayerNameByUserID( INT_ATTACKER );
     local INDEX_Attacker = client.GetPlayerIndexByUserID( INT_ATTACKER );

     if ( INDEX_Attacker == ME and INDEX_Victim ~= ME ) then
             client.Command("play buttons\\arena_switch_press_02.wav", true);
     end

 end

end

client.AllowListener( 'player_hurt' );

callbacks.Register( 'FireGameEvent', 'Hitsound', Sounds );